The chemistry of self-propagating high-temperature synthesis

Мержанов, А. Г.

doi:10.1039/b401358c

Cited by 319 publications

(180 citation statements)

References 11 publications

(10 reference statements)

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“…To minimize the difficulties posed by the mixed oxide method, various methods of chemical synthesis have been used in the laboratory to obtain ferrites, mainly in order to control their microstructure and magnetic properties by controlling characteristics such as purity, chemical homogeneity, shape and mean particle size of powders [3][4][5][6] . In the past decade, the solution combustion method was widely used to synthesize single or mixed metal oxides [7][8][9][10][11][12] . Organic compounds (e.g., glycine, urea, citric acid, alanine and carbohydrazine) have been mixed directly with metal to increase the efficiency of the nitrate combustion synthesis method.…”

Section: Introductionmentioning

confidence: 99%

Microwave Assisted Combustion Synthesis and Characterization of Nanocrystalline Nickel-doped Cobalt Ferrites

et al. 2016

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)] were prepared by the microwave combustion synthesis, using a stoichiometric mixture of metal nitrates and urea as the oxidizer and fuel to drive the reaction. The effect of microwave irradiation on the phase composition was favorable to promote the formation of fluffy foams and nanoparticles sizes. The fast internal heating with microwaves leads to a reduction in synthesis time, to only 2 min. The structural, chemical and magnetic properties of the nickel-doped cobalt ferrites were analyzed by XRD, TEM, SEM and BET. The XRD results confirmed the formation of pure and single-phase spinel structure. The crystallite size of the nanoparticles was in the range of 38 -50 nm. SEM images show nanoparticles with spherical shape and homogenous morphology. The TEM analysis shows necked near-spherical particles with an average size of ~30 -50 nm, reflecting the highly crystalline nature of these nanoparticles. The magnetic measurements of all the samples were recorded using vibrating sample magnetometer (VSM) at room temperature in 10 kOe. Increasing the nickel content directly affects the structural characteristics of the particles, causing a reduction in the coercive field.

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Section: Introductionmentioning

confidence: 99%

Microwave Assisted Combustion Synthesis and Characterization of Nanocrystalline Nickel-doped Cobalt Ferrites

et al. 2016

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“…Here we present an example of a movie of a self-propagating high temperature reaction [38][39][40][41][42][43][44][45] in a stoichiometric mixture of titanium and silicon. In these reactions the material changes from a pressed powder to a ceramic pellet.…”

Section: Radiography Of Self-propagating High Temperature Chemical Rementioning

confidence: 99%

New Developments in Proton Radiography at the Los Alamos Neutron Science Center (LANSCE)

et al. 2015

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An application of nuclear physics, a facility for using protons for flash radiography, has been developed at the Los Alamos Neutron Science Center (LANSCE). Protons have proven far superior to high energy x-rays for flash radiography because of their long mean free path, good position resolution, and low scatter background. Although this facility is primarily used for studying very fast phenomena such as high explosive driven experiments, it is finding increasing application to other fields, such as tomography of static objects, phase changes in materials and the dynamics of chemical reactions. The advantages of protons are discussed, data from some recent experiments will be reviewed and concepts for new techniques are introduced.

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“…Note that foil inflammation temperature, obtained for different heating rates, is in the range of 350-500 °C that is by 200-300 °C lower than the temperature of inflammation of powder samples of a similar composition (Ti + Al) [1,2].…”

mentioning

confidence: 99%

“…It is known that consolidated systems, based on elements capable of entering into synthesis reaction, have become widely applied, primarily due to the possibility of synthesizing refractory compounds, intermetallics and ceramics in the reaction process, as well as depositing coatings on their base, and producing permanent joints [1,2]. The latter is due, mainly, to the fact that the synthesis process in such systems is accompanied by intensive heat evolution, which is sufficient for realization of welding or brazing process with limited use of external energy sources [3][4][5].…”

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confidence: 99%

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Influence of heating rate on inflammation temperature of mutlilayer Ti/Al foil

Kuzmenko¹,

Ustinov²,

Kosintsev³

et al. 2014

The Paton Welding J.

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Self-sustaining exothermal reaction of synthesis in multilayer foil consisting of intermetallic forming elements may proceed by means of self-propagation of high-temperature synthesis reaction front through foil (self-propagating high-temperature synthesis (SHS) or as a result of synthesis reaction running through the entire volume (autoinflammation (AI)). The latter is realized under the condition of foil heating up to a certain critical temperature, at which the synthesis reaction runs in the entire volume without external heat supply. In the work influence of foil heating rate on AI temperature was studied in the case of Ti/Al multilayer foil. It is shown that there exists a certain critical heating rate, below which foil AI is not observed, and at heating rates above the critical rate AI temperature decreases with increase of heating rate. Dependence of AI temperature on heating rate is nonmonotonic: at low heating rates AI temperature abruptly decreases, and at further increase of heating rate AI temperature remains practically unchanged. Such nonmonotonic dependence of foil AI temperature on heating rate is associated with running of the process of thermally activated solid phase reactions in it, which are accompanied by formation of intermetallic interlayers on the boundary between titanium and aluminium layers, preventing diffusion mixing of elements. With increase of heating rate, interlayer thickness decreases, promoting AI temperature lowering. 11 Ref., 4 Figures.

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The chemistry of self-propagating high-temperature synthesis

Cited by 319 publications

References 11 publications

Microwave Assisted Combustion Synthesis and Characterization of Nanocrystalline Nickel-doped Cobalt Ferrites

Microwave Assisted Combustion Synthesis and Characterization of Nanocrystalline Nickel-doped Cobalt Ferrites

New Developments in Proton Radiography at the Los Alamos Neutron Science Center (LANSCE)

Influence of heating rate on inflammation temperature of mutlilayer Ti/Al foil

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